Remove unused db api call.

There is unused db api call in NetworkManager
setup_networks_on_host() method, results from
this call not used, no specific exception raised,
this patch just remove it.

Change-Id: Icf898dcdda635a3a78c92e76ec0e19c6ab075ce1
Merge "Remove unused db api call."
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp